Legacy effects cause systematic underestimation of N2O emission factors

文献类型： 外文期刊

第一作者： Qian, Haoyu

作者： Qian, Haoyu;Yuan, Zhengqi;Chen, Nana;Wang, Songhan;Liu, Zhenghui;Li, Ganghua;Ding, Yanfeng;Jiang, Yu;Zhu, Xiangcheng;Huang, Shan;Huang, Shan;Lu, Changying;Liu, Kailou;Zhou, Feng;Smith, Pete;Tian, Hanqin;Xu, Qiang;Zou, Jianwen;Liu, Shuwei;Song, Zhenwei;Zhang, Weijian;Shang, Ziyin;van Groenigen, Kees Jan

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：15.7； 五年影响因子：17.2 ）

ISSN：

年卷期： 2025 年 16 卷 1 期

页码：

收录情况： SCI

摘要： Agricultural soils contribute similar to 52% of global anthropogenic nitrous oxide (N2O) emissions, predominantly from nitrogen (N) fertilizer use. Global N2O emission factors (EFs), estimated using IPCC Tier 1 methodologies, largely rely on short-term field measurements that ignore legacy effects of historic N fertilization. Here we show, through data synthesis and experiments, that EFs increase over time. Historic N addition increases soil N availability, lowers soil pH, and stimulates the abundance of N2O producing microorganisms and N2O emissions in control plots, causing underestimates of EFs in short-term experiments. Accounting for this legacy effect, we estimate that global EFs and annual fertilizer-induced N2O emissions of cropland are 1.9% and 2.1 Tg N2O-N yr(-1), respectively, both similar to 110% higher than IPCC estimates. Our findings highlight the significance of legacy effects on N2O emissions, emphasize the importance of long-term experiments for accurate N2O emission estimates, and underscore the need for mitigation practices to reduce N2O emissions.

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